FFmpeg Drawtext Filter for Overlays, Scrolling Text, Timestamps on Videos

Re:FFmpeg Drawtext Filter for Overlays, Scrolling Text, Time... by fireattack on Friday October 23, 2020 @03:22AM (#24866837)

If compression ratio or filesize isn't a priority, NVENC definitely is good enough to consider. The speed is just too good.

It can do 300fps+ (for simply transcoding. Burning in subtitles probably will slow it down a little ibt) already on my very dated GPU, likely would be even faster on newer ones.

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Re:FFmpeg Drawtext Filter for Overlays, Scrolling Text, Time... by ethanwillis on Friday October 23, 2020 @04:30AM (#24867197)

What some people might not know is that the transcoding results and quality are hardware dependent. You will get different results depending on whether you're using NVENC, intel's on chip stuff, actual encoding hardware, etc.

Edit: Obviously it's more complicated than this. But I think this is one of the reasons behind the need for things like Netflix's VMAF

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Re:FFmpeg Drawtext Filter for Overlays, Scrolling Text, Time... by izacus on Friday October 23, 2020 @04:43AM (#24867255)

Also generations of hardware matter - earlier GeForces and Intel CPUs have a worse encoding block than newer generations.

In any case, they massively lag behind software encoding.

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Re:FFmpeg Drawtext Filter for Overlays, Scrolling Text, Time... by fireattack on Friday October 23, 2020 @05:09AM (#24867408)

I mean, obviously it would be the case for NVENC. Old(er) versions don't even support B frames.

But I guess you can call it "firmware" or "software" dependant too, because they don't really use/support the same version of NVENC to begin with.

And I doubt the result is significantly different, if any, for software encoders like x264 - of course assuming you use the exactly same version and parameter.

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